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UC3842AD - Texas Instruments

Description: Current Mode PWM Controller

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UC3842AD - Texas Instruments PCB footprint - Small Outline Packages - Small Outline Packages - D (PDSO-G14)_8
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UC3842AD - Texas Instruments  - 3D model - Small Outline Packages - D (PDSO-G14)_8
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UC3842AD Details

  • Manufacturer Part Number:

    UC3842AD

  • Brand Name:

    Texas Instruments

  • Pbfree Code:

    Yes

  • Rohs Code:

    Yes

  • Part Life Cycle Code:

    Active

  • Part Package Code:

    SOIC

  • Pin Count:

    14

  • Country Of Origin:

    Mexico

  • ECCN Code:

    EAR99

  • HTS Code:

    8542.39.00.90

  • Manufacturer:

    Texas Instruments

  • YTEOL:

    15

  • Analog IC - Other Type:

    SWITCHING CONTROLLER

  • Control Mode:

    CURRENT-MODE

  • Control Technique:

    PULSE WIDTH MODULATION

  • Input Voltage-Max:

    28 V

  • Input Voltage-Min:

    11.5 V

  • Input Voltage-Nom:

    15 V

  • JESD-30 Code:

    R-PDSO-G14

  • JESD-609 Code:

    e4

  • Length:

    8.65 mm

  • Moisture Sensitivity Level:

    1

  • Number of Functions:

    1

  • Number of Terminals:

    14

  • Operating Temperature-Max:

    70 °C

  • Output Current-Max:

    1 A

  • Output Voltage-Max:

    5.1 V

  • Output Voltage-Min:

    4.9 V

  • Output Voltage-Nom:

    5 V

  • Package Body Material:

    PLASTIC/EPOXY

  • Package Code:

    SOP

  • Package Equivalence Code:

    SOP14,.25

  • Package Shape:

    RECTANGULAR

  • Package Style:

    SMALL OUTLINE

  • Peak Reflow Temperature (Cel):

    260

  • Qualification Status:

    Not Qualified

  • Seated Height-Max:

    1.75 mm

  • Supply Current-Max (Isup):

    25 mA

  • Supply Voltage-Max (Vsup):

    28 V

  • Supply Voltage-Min (Vsup):

    16 V

  • Supply Voltage-Nom (Vsup):

    11 V

  • Surface Mount:

    YES

  • Switcher Configuration:

    BUCK-BOOST

  • Switching Frequency-Max:

    500 kHz

  • Technology:

    BIPOLAR

  • Temperature Grade:

    COMMERCIAL

  • Terminal Finish:

    Nickel/Palladium/Gold (Ni/Pd/Au)

  • Terminal Form:

    GULL WING

  • Terminal Pitch:

    1.27 mm

  • Terminal Position:

    DUAL

  • Time@Peak Reflow Temperature-Max (s):

    30

  • Width:

    3.9 mm

UC3842AD Frequently Asked Questions (FAQs)

  • The recommended operating voltage range for UC3842AD is 12V to 28V, with a maximum rating of 30V.
  • The oscillator circuit resistor values (Rt and Ct) can be calculated using the formulae provided in the datasheet. A general guideline is to choose Rt = 10kΩ to 100kΩ and Ct = 3.3nF to 10nF for a frequency range of 10kHz to 100kHz.
  • The soft-start pin (SS) is used to gradually increase the output voltage during startup, reducing inrush currents and electromagnetic interference (EMI). Connect a capacitor (typically 10nF to 100nF) from SS to GND, and a resistor (typically 1kΩ to 10kΩ) from SS to VCC.
  • The voltage drop across Rcs can be compensated by adding a voltage offset to the current sense input (CS) pin. The offset voltage can be calculated using the formula: Voffset = (Rcs x Iout) / (R1 + R2), where R1 and R2 are the resistors in the voltage divider network.
  • The maximum allowable current through Q1 is 1.5A. To limit the current, use a current sense resistor (Rcs) and set the current limit threshold (Ilim) using the formula: Ilim = 0.5V / Rcs. Choose Rcs to limit the current to the desired value.

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UC3842AD Overview

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About Texas Instruments

Texas Instruments (TI) designs and manufactures semiconductors and integrated circuits for a wide range of applications. The company's product portfolio includes analog chips, which are essential for managing power and signal functions in electronic devices, and embedded processors, which serve as the brains in various systems, enabling functionality in everything from industrial equipment to consumer electronics. TI's innovations in semiconductor technology have made it a leader in the industry.

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